Foamable resin composition and foamed body

Abstract

A foamable resin composition according to the present invention comprises starch, an aliphatic polyester and water, and wherein 10 to 40 parts by mass of the water and 10 to 80 parts by mass of the aliphatic polyester are included with respect to 100 parts by mass of the starch. The foamable resin composition preferably comprises 3 to 60 parts by mass of a glycerin with respect to 100 parts by mass of the starch. The whole composition of the foamable resin composition is made of a biodegradable raw material, and the molded product of the composition has excellent water resistance and favorable moldability, is free from problems in mechanical characteristics such as strength, and also has a cost advantage.

1 . A foamable resin composition comprising starch, an aliphatic polyester and water, wherein 10 to 40 parts by mass of the water and 10 to 80 parts by mass of the aliphatic polyester are included with respect to 100 parts by mass of the starch. 
     
     
         2 . A foamable resin composition according to  claim 1 , further comprising glycerin. 
     
     
         3 . A foamable resin composition according to  claim 2 , wherein 3 to 60 parts by mass of the glycerin are included with respect to 100 parts by mass of the starch. 
     
     
         4 . A foamable resin composition according to  claim 1 , wherein a melting point of the aliphatic polyester is 100° C. or higher. 
     
     
         5 . A foamable resin composition according to  claim 1 , further comprising a surfactant. 
     
     
         6 . A foamable resin composition according to  claim 5 , wherein the surfactant is a nonionic surfactant. 
     
     
         7 . A foamable resin composition according to  claim 5 , wherein 0.2 to 5 parts by mass of the surfactant are included with respect to 100 parts by mass of the starch. 
     
     
         8 . A foamable resin composition according to  claim 1 , further comprising a cross-linking agent. 
     
     
         9 . A foamable resin composition according to  claim 8 , wherein 0.01 to 2 parts by mass of the cross-linking agent are included with respect to 100 parts by mass of the starch. 
     
     
         10 . A foamable resin composition according to  claim 1 , further comprising 0.3 to 10 parts by mass of an inorganic compound with respect to 100 parts by mass of a total amount of the starch and the aliphatic polyester. 
     
     
         11 . A foamed body obtained by foaming the foamable resin composition according to  claim 1 .